Saw-setting apparatus.



No. 646,|59. Patented Mar. 27, i900.

S. R. ROBINSON.

SAW SETTING APPARATUS.

(Application led July 10, 1899.) (N o M o d el me News Prrsns co., mmm.

UNITE TATES ATnNrerrrcn.

SAMUEL R. ROBNSON, OF ANTRIM, NEWl HAMPSHIRE.

SAW-SETTING APPARATUS.

SPECIFICATION forming pari, Of LGJGTS Patent N0. 646,159, dated March 27, 1900;

Application led July 10, 1899. Serial No. 723,276. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL R. RoBNsoN,

-of Antrim, county of Hillsborough, State of New Hampshire, have invented an Improvement in Saw-Setting Apparatus, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the-drawings repre` senting like parts. f

ln setting the teeth of saws it has been customary heretofore to make the set straight across the tooth, substantially parallel to the path assumed by the tooth in passing through the material to be sawed, so that the front and rear edges of the tooth lie in the same plane and are in Yengagement with the material and no clearance is afforded.

My invention has for its object the production of a novel and effective saw-setting apparatus.

Figure l, in side elevation, represents a sawsetting apparatus embodying one form of my invention. Fig. Z'is a partial plan view and horizontal section on the line no, Fig. 1. Fig. 3 is a vertical sectional view taken through the anvil and setting-plunger. Fig. 4 is a sectional detail 0n the line no x', Fig. 2, of the means for maintainingY the saw-support in adjusted position, and Fig; 5 shows in plan and edge view a saw-tooth set in accordance with my invention and also like views of a tooth set in the customary manner.

I have herein shown the frame as comprising upright end pieces A B, adapted to be bolted or otherwise secured to thefloor, bench, or other support and rigidly connected by two parallel and Yhorizontal guide-rods AX, the end A being open or arched, as shown in Fig. 3, for a purpose to be described and provided at its top with' a preferably circular seat a, from which depends a hollow boss d into the arched or open portion of the end piece A. Upon this-seat is mounted the cory respondingly-shaped foot a2 of the anvil A2,

having a preferably beveled upper face 0,3, with a straight front edge or corner 0.4, over which the teeth are set. The body of the anvil is rearwardly and upwardly extended to form an arm A3, overhanging the anvil and forming an upright bearing for a verticallymovable set or plunger P, the lower working face p thereof bein g beveled to coperate with .as at da, to receive a laterally-extended pin or projection p', Fig. 3, on the plunger, the* slot intersecting the plunger-bearing, so that while the. plunger can reciprocate it is prevented frorn rotative movement. A liftingspring s is inserted iny thesocket a5 below the pin p', and above the latter the socket is threaded to receive an adjustable threaded plug or stop a7, which limits the upward or spring-impelled stroke of the set P. By adjusting the s top the stroke of the set is regulated to the thickness of the teeth to be set, it being most desirable that the face of the set be as near the work as possible before the tooth is set in order that the operator can adjust the tooth properly and accurately upon the anvil. l

The set P isstruck on its upper end with a 'hammer in usual manner to swage the tooth la center to vary the angle at vwhichy the setting-corner d4 of the anvil is Vpresented to the root of the tooth to be set, as will be explained, different positions of the anvil ,being shown by full and dotted lines, Fig. 2l

I have herein shown a circular saw T sustained upon a conical holder cx, which is rotatable on an upright spindle c, provided with a collar c for 'the holder, the spindle being mounted on a carriage movable on the guides AX. Referring to Figs. 2 and 4, the carriage is represented as composed of two members c2 c3, the formerhaving aneye 2 at one end to embrace one of the guide-rods AX and two separated eyes 4 4 at the 'other end to embrace the other of said guides, the body of said member between the guides entering between the legs 3 of the bifurcated member es, which latter straddles the other guide A between the two eyes e. The spindle c passes vertically IOO through registering holes 2O 30 in the two members of the carriage, Fig. 4, so that when the member c3 is drawn to the right, Fig. 4., it forces the spindle c against the right-hand side of the hole 2O in the member c2, so that the spindle will be clamped and held at any desired height vertically to regulate the amount of setto be given to the saw. A clamping-screw c4 passes through a threaded hole in the carriage member e3 and is shown in Fig. at as bearing against a follower e5, interposed between the clamping-screw and the guide AX, so that when the screw is turned in it operates to draw the member c3 to the right, Fig. 4, and through the spindle cthe member c2 is drawn against the left-hand guide AX, not only tightly clamping the spindle c in vertically-adj usted position, but also holding the carriage on the guides in adjusted position relatively to the anvil, according to the diameter of the saw the teeth of which are to be set. The follower c5 prevents the screw e4 from marring the adjacent guide-rod. This makes a very convenient and simple clamping device, rapidly and easily operated. It will be obvious that the saw is supported at the proper height on the supporting means described in such position that one tooth after another can be brought into position on the anvil to be set.

I prefer to provide an auxiliary rest for the saw near its periphery to prevent tipping of the latter on its support, and for this purpose I have herein shown a second carriage e2 e3, substantially like the carriage members c2 c3 described and mounted in the same way on the guides AX and clamped by a clampingscrew e4, Fig. 2. A vertical spindle e passes through holes in the overlapping parts of the members e2 e3 and is held in vertically-adj usted position by the clamping-screw e4, said spindle having Xed to its upper end laterally-extended arms e0, carrying upturned fingers e7 at their outer ends to engage the uuder surface of the blade. The separation of the fingers and the cone provides for three points of support for the saw, holding the same lightly, yet steadily, during the setting operation. l

Referring now to Fig. 5, the tooth t (shown in side and edge elevation) is represented as customarily swaged over or set along the line 5 5, which is substantially parallel to the root of the tooth, the front and rear edges of the swaged portion t of the tooth lying in the same plane, so that when the tooth passes through the material there is no clearance, and the set portion is in close contact with the material throughout its passage therethrough. In setting the tooth in accordance with my invention the point is swaged over on a line at an angle to the root of the tooth, as along the line 6 6, Fig. 5, so that the front and rear edges of the swaged or set portion o of the tooth yv lie in different planes, the

edge 60 denoting the cutting edge, and I thus eilect a free clearance as the tooth passes through the stock, greatly reducing the friction and wear and requiring much less power 1 to drive the saw.

With the diagonal or oblique set the saw remains sharper fora muchlonger time than is possible with the customary setting.

By varying the relative position of the sawsupport and swaging edge or corner of the anvil the setting angle can be varied according to requirements, yand such adjustment is herein effected by-the rotative movement of the anvil on the frame.

Ilavin g fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In an apparatus of the class described, an anvil, a cooperating setting member, a saw-support vertically movable and also movable toward and from the anvil, and a single means to control both movements of said support.

2. In an apparatus of the class described, a frame including horizontal guide members, a carriage movable thereon, a saw-supporting spindle vertically movable in the carriage, and common clamping means to maintain the spindle and carriage in adjusted position.

3. In an apparatus of the class described, a horizontally-movable carriage, a verticallymovable saw-support mounted thereon, and means to simultaneously clamp both the said support in vertical and the carriage in horizontal adjusted position.

4. In an apparatus of the class described, an anvil, a cooperating, spring-lifted settingplunger, and an adjustable stop to limit the upward stroke of the plunger.

5. In an apparatus of the class described, an anvil, an upright bearing having a longitudinal slot, areciprocable, spring-lifted setting-plunger having a lug to enter and slide in the slot, and an adjustable stop to limit the spring-impelled stroke of the plunger.

6. In an apparatus of the class described, a vertically and horizontally adjustable sawsupport, and means including a single clamping-screw, to maintain said support in both vertical and horizontal adjustment.

7. A carriage, a support upon which it is horizontally adjustable, a sliding spindle vertically adjustable relatively to the carriage, and means to simultaneously clamp said spindle in vertical, and the carriage in horizontal, adjusted position.

In testimony whereof I have signed my name to this specification in the presence of y two subscribing Witnesses.

SAMUEL R. ROBINSON. Witnesses:

EPHRAIM SIMoNDs, HAs. Il. MARTIN. 

